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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.10505">arXiv:2407.10505</a> <span> [<a href="https://arxiv.org/pdf/2407.10505">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Dynamics of Nanoscale Phase Decomposition in Laser Ablation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Sun%2C+Y">Yanwen Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+C">Chaobo Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Albert%2C+T+J">Thies J. Albert</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+H">Haoyuan Li</a>, <a href="/search/cond-mat?searchtype=author&query=Arefev%2C+M+I">Mikhail I. Arefev</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+Y">Ying Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Dunne%2C+M">Mike Dunne</a>, <a href="/search/cond-mat?searchtype=author&query=Glownia%2C+J+M">James M. Glownia</a>, <a href="/search/cond-mat?searchtype=author&query=Hoffmann%2C+M">Matthias Hoffmann</a>, <a href="/search/cond-mat?searchtype=author&query=Hurley%2C+M+J">Matthew J. Hurley</a>, <a href="/search/cond-mat?searchtype=author&query=Mo%2C+M">Mianzhen Mo</a>, <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L">Quynh L. Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Sato%2C+T">Takahiro Sato</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+S">Sanghoon Song</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+P">Peihao Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Sutton%2C+M">Mark Sutton</a>, <a href="/search/cond-mat?searchtype=author&query=Teitelbaum%2C+S">Samuel Teitelbaum</a>, <a href="/search/cond-mat?searchtype=author&query=Valavanis%2C+A+S">Antonios S. Valavanis</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+N">Nan Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+D">Diling Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhigilei%2C+L+V">Leonid V. Zhigilei</a>, <a href="/search/cond-mat?searchtype=author&query=Sokolowski-Tinten%2C+K">Klaus Sokolowski-Tinten</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.10505v1-abstract-short" style="display: inline;"> Femtosecond laser ablation is a process that bears both fundamental physics interest and has wide industrial applications. For decades, the lack of probes on the relevant time and length scales has prevented access to the highly nonequilibrium phase decomposition processes triggered by laser excitation. Enabled by the unprecedented intense femtosecond X-ray pulses delivered by an X-ray free electr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.10505v1-abstract-full').style.display = 'inline'; document.getElementById('2407.10505v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.10505v1-abstract-full" style="display: none;"> Femtosecond laser ablation is a process that bears both fundamental physics interest and has wide industrial applications. For decades, the lack of probes on the relevant time and length scales has prevented access to the highly nonequilibrium phase decomposition processes triggered by laser excitation. Enabled by the unprecedented intense femtosecond X-ray pulses delivered by an X-ray free electron laser, we report here results of time-resolved small angle scattering measurements on the dynamics of nanoscale phase decomposition in thin gold films upon femtosecond laser-induced ablation. By analyzing the features imprinted onto the small angle diffraction patterns, the transient heterogeneous density distributions within the ablation plume as obtained from molecular dynamics simulations get direct experimental confirmation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.10505v1-abstract-full').style.display = 'none'; document.getElementById('2407.10505v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Main manuscript with 32 pages incl. 9 figures + supplementary materials with 16 pages incl. 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.03169">arXiv:2403.03169</a> <span> [<a href="https://arxiv.org/pdf/2403.03169">pdf</a>, <a href="https://arxiv.org/format/2403.03169">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> Dynamical decoding of the competition between charge density waves in a kagome superconductor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ning%2C+H">Honglie Ning</a>, <a href="/search/cond-mat?searchtype=author&query=Oh%2C+K+H">Kyoung Hun Oh</a>, <a href="/search/cond-mat?searchtype=author&query=Su%2C+Y">Yifan Su</a>, <a href="/search/cond-mat?searchtype=author&query=von+Hoegen%2C+A">Alexander von Hoegen</a>, <a href="/search/cond-mat?searchtype=author&query=Porter%2C+Z">Zach Porter</a>, <a href="/search/cond-mat?searchtype=author&query=Salinas%2C+A+C">Andrea Capa Salinas</a>, <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L">Quynh L Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Chollet%2C+M">Matthieu Chollet</a>, <a href="/search/cond-mat?searchtype=author&query=Sato%2C+T">Takahiro Sato</a>, <a href="/search/cond-mat?searchtype=author&query=Esposito%2C+V">Vincent Esposito</a>, <a href="/search/cond-mat?searchtype=author&query=Hoffmann%2C+M+C">Matthias C Hoffmann</a>, <a href="/search/cond-mat?searchtype=author&query=White%2C+A">Adam White</a>, <a href="/search/cond-mat?searchtype=author&query=Melendrez%2C+C">Cynthia Melendrez</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+D">Diling Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+S+D">Stephen D Wilson</a>, <a href="/search/cond-mat?searchtype=author&query=Gedik%2C+N">Nuh Gedik</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.03169v1-abstract-short" style="display: inline;"> The kagome superconductor CsV$_3$Sb$_5$ hosts a variety of charge density wave (CDW) phases, which play a fundamental role in the formation of other exotic electronic instabilities. However, identifying the precise structure of these CDW phases and their intricate relationships remain the subject of intense debate, due to the lack of static probes that can distinguish the CDW phases with identical… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.03169v1-abstract-full').style.display = 'inline'; document.getElementById('2403.03169v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.03169v1-abstract-full" style="display: none;"> The kagome superconductor CsV$_3$Sb$_5$ hosts a variety of charge density wave (CDW) phases, which play a fundamental role in the formation of other exotic electronic instabilities. However, identifying the precise structure of these CDW phases and their intricate relationships remain the subject of intense debate, due to the lack of static probes that can distinguish the CDW phases with identical spatial periodicity. Here, we unveil the competition between two coexisting $2\times2\times2$ CDWs in CsV$_3$Sb$_5$ harnessing time-resolved X-ray diffraction. By analyzing the light-induced changes in the intensity of CDW superlattice peaks, we demonstrate the presence of both phases, each displaying a significantly different amount of melting upon excitation. The anomalous light-induced sharpening of peak width further shows that the phase that is more resistant to photo-excitation exhibits an increase in domain size at the expense of the other, thereby showcasing a hallmark of phase competition. Our results not only shed light on the interplay between the multiple CDW phases in CsV$_3$Sb$_5$, but also establish a non-equilibrium framework for comprehending complex phase relationships that are challenging to disentangle using static techniques. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.03169v1-abstract-full').style.display = 'none'; document.getElementById('2403.03169v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures with supplemental Material</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.11634">arXiv:2402.11634</a> <span> [<a href="https://arxiv.org/pdf/2402.11634">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Non-equilibrium pathways to emergent polar supertextures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Stoica%2C+V+A">Vladimir A. Stoica</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+T">Tiannan Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Das%2C+S">Sujit Das</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+Y">Yue Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Huaiyu Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Kubota%2C+Y">Yuya Kubota</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+C">Cheng Dai</a>, <a href="/search/cond-mat?searchtype=author&query=Padmanabhan%2C+H">Hari Padmanabhan</a>, <a href="/search/cond-mat?searchtype=author&query=Sato%2C+Y">Yusuke Sato</a>, <a href="/search/cond-mat?searchtype=author&query=Mangu%2C+A">Anudeep Mangu</a>, <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L">Quynh L. Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+Z">Zhan Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Talreja%2C+D">Disha Talreja</a>, <a href="/search/cond-mat?searchtype=author&query=Zajac%2C+M+E">Marc E. Zajac</a>, <a href="/search/cond-mat?searchtype=author&query=Walko%2C+D+A">Donald A. Walko</a>, <a href="/search/cond-mat?searchtype=author&query=DiChiara%2C+A+D">Anthony D. DiChiara</a>, <a href="/search/cond-mat?searchtype=author&query=Owada%2C+S">Shigeki Owada</a>, <a href="/search/cond-mat?searchtype=author&query=Miyanishi%2C+K">Kohei Miyanishi</a>, <a href="/search/cond-mat?searchtype=author&query=Tamasaku%2C+K">Kenji Tamasaku</a>, <a href="/search/cond-mat?searchtype=author&query=Sato%2C+T">Takahiro Sato</a>, <a href="/search/cond-mat?searchtype=author&query=Glownia%2C+J+M">James M. Glownia</a>, <a href="/search/cond-mat?searchtype=author&query=Esposito%2C+V">Vincent Esposito</a>, <a href="/search/cond-mat?searchtype=author&query=Nelson%2C+S">Silke Nelson</a>, <a href="/search/cond-mat?searchtype=author&query=Hoffmann%2C+M+C">Matthias C. Hoffmann</a>, <a href="/search/cond-mat?searchtype=author&query=Schaller%2C+R+D">Richard D. Schaller</a> , et al. (9 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.11634v1-abstract-short" style="display: inline;"> Ultrafast stimuli can stabilize metastable states of matter inaccessible by equilibrium means. Establishing the spatiotemporal link between ultrafast excitation and metastability is crucial to understanding these phenomena. Here, we use single-shot optical-pump, X-ray-probe measurements to provide snapshots of the emergence of a persistent polar vortex supercrystal in a heterostructure that hosts… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.11634v1-abstract-full').style.display = 'inline'; document.getElementById('2402.11634v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.11634v1-abstract-full" style="display: none;"> Ultrafast stimuli can stabilize metastable states of matter inaccessible by equilibrium means. Establishing the spatiotemporal link between ultrafast excitation and metastability is crucial to understanding these phenomena. Here, we use single-shot optical-pump, X-ray-probe measurements to provide snapshots of the emergence of a persistent polar vortex supercrystal in a heterostructure that hosts a fine balance between built-in electrostatic and elastic frustrations by design. By perturbing this balance with photoinduced charges, a starting heterogenous mixture of polar phases disorders within a few picoseconds, resulting in a soup state composed of disordered ferroelectric and suppressed vortex orders. On the pico-to-nanosecond timescales, transient labyrinthine fluctuations form in this soup along with a recovering vortex order. On longer timescales, these fluctuations are progressively quenched by dynamical strain modulations, which drive the collective emergence of a single supercrystal phase. Our results, corroborated by dynamical phase-field modeling, reveal how ultrafast excitation of designer systems generates pathways for persistent metastability. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.11634v1-abstract-full').style.display = 'none'; document.getElementById('2402.11634v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.04962">arXiv:2402.04962</a> <span> [<a href="https://arxiv.org/pdf/2402.04962">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Hidden domain boundary dynamics towards crystalline perfection </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mangu%2C+A">A. Mangu</a>, <a href="/search/cond-mat?searchtype=author&query=Stoica%2C+V+A">V. A. Stoica</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+H">H. Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+T">T. Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+M">M. Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">H. Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L">Q. L. Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+S">S. Song</a>, <a href="/search/cond-mat?searchtype=author&query=Das%2C+S">S. Das</a>, <a href="/search/cond-mat?searchtype=author&query=Meisenheimer%2C+P">P. Meisenheimer</a>, <a href="/search/cond-mat?searchtype=author&query=Donoway%2C+E">E. Donoway</a>, <a href="/search/cond-mat?searchtype=author&query=Chollet%2C+M">M. Chollet</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+Y">Y. Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Turner%2C+J+J">J. J. Turner</a>, <a href="/search/cond-mat?searchtype=author&query=Freeland%2C+J+W">J. W. Freeland</a>, <a href="/search/cond-mat?searchtype=author&query=Wen%2C+H">H. Wen</a>, <a href="/search/cond-mat?searchtype=author&query=Martin%2C+L+W">L. W. Martin</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+L+-">L. -Q. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Gopalan%2C+V">V. Gopalan</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+D">D. Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+Y">Y. Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Lindenberg%2C+A+M">A. M. Lindenberg</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.04962v2-abstract-short" style="display: inline;"> A central paradigm of non-equilibrium physics concerns the dynamics of heterogeneity and disorder, impacting processes ranging from the behavior of glasses to the emergent functionality of active matter. Understanding these complex mesoscopic systems requires probing the microscopic trajectories associated with irreversible processes, the role of fluctuations and entropy growth, and the timescales… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.04962v2-abstract-full').style.display = 'inline'; document.getElementById('2402.04962v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.04962v2-abstract-full" style="display: none;"> A central paradigm of non-equilibrium physics concerns the dynamics of heterogeneity and disorder, impacting processes ranging from the behavior of glasses to the emergent functionality of active matter. Understanding these complex mesoscopic systems requires probing the microscopic trajectories associated with irreversible processes, the role of fluctuations and entropy growth, and the timescales on which non-equilibrium responses are ultimately maintained. Approaches that illuminate these processes in model systems may enable a more general understanding of other heterogeneous non-equilibrium phenomena, and potentially define ultimate speed and energy cost limits for information processing technologies. Here, we apply ultrafast single shot x-ray photon correlation spectroscopy to resolve the non-equilibrium, heterogeneous, and irreversible mesoscale dynamics during a light-induced phase transition. This approach defines a new way of capturing the nucleation of the induced phase, the formation of transient mesoscale defects at the boundaries of the nuclei, and the eventual annihilation of these defects, even in systems with complex polarization topologies. A non-equilibrium response spanning >10 orders of magnitude in timescales is observed, with multistep behavior similar to the plateaus observed in supercooled liquids and glasses. We show how the observed time-dependent long-time correlations can be understood in terms of the stochastic dynamics of domain walls, encoded in effective waiting-time distributions with power-law tails. This work defines new possibilities for probing the non-equilibrium and correlated dynamics of disordered and heterogeneous media. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.04962v2-abstract-full').style.display = 'none'; document.getElementById('2402.04962v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.02170">arXiv:2306.02170</a> <span> [<a href="https://arxiv.org/pdf/2306.02170">pdf</a>, <a href="https://arxiv.org/format/2306.02170">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Observation of time-reversal symmetry breaking in the band structure of altermagnetic RuO$_2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fedchenko%2C+O">O. Fedchenko</a>, <a href="/search/cond-mat?searchtype=author&query=Minar%2C+J">J. Minar</a>, <a href="/search/cond-mat?searchtype=author&query=Akashdeep%2C+A">A. Akashdeep</a>, <a href="/search/cond-mat?searchtype=author&query=D%27Souza%2C+S+W">S. W. D'Souza</a>, <a href="/search/cond-mat?searchtype=author&query=Vasilyev%2C+D">D. Vasilyev</a>, <a href="/search/cond-mat?searchtype=author&query=Tkach%2C+O">O. Tkach</a>, <a href="/search/cond-mat?searchtype=author&query=Odenbreit%2C+L">L. Odenbreit</a>, <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L">Q. L. Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Kutnyakhov%2C+D">D. Kutnyakhov</a>, <a href="/search/cond-mat?searchtype=author&query=Wind%2C+N">N. Wind</a>, <a href="/search/cond-mat?searchtype=author&query=Wenthaus%2C+L">L. Wenthaus</a>, <a href="/search/cond-mat?searchtype=author&query=Scholz%2C+M">M. Scholz</a>, <a href="/search/cond-mat?searchtype=author&query=Rossnagel%2C+K">K. Rossnagel</a>, <a href="/search/cond-mat?searchtype=author&query=Hoesch%2C+M">M. Hoesch</a>, <a href="/search/cond-mat?searchtype=author&query=Aeschlimann%2C+M">M. Aeschlimann</a>, <a href="/search/cond-mat?searchtype=author&query=Stadtmueller%2C+B">B. Stadtmueller</a>, <a href="/search/cond-mat?searchtype=author&query=Klaeui%2C+M">M. Klaeui</a>, <a href="/search/cond-mat?searchtype=author&query=Schoenhense%2C+G">G. Schoenhense</a>, <a href="/search/cond-mat?searchtype=author&query=Jakob%2C+G">G. Jakob</a>, <a href="/search/cond-mat?searchtype=author&query=Jungwirth%2C+T">T. Jungwirth</a>, <a href="/search/cond-mat?searchtype=author&query=Smejkal%2C+L">L. Smejkal</a>, <a href="/search/cond-mat?searchtype=author&query=Sinova%2C+J">J. Sinova</a>, <a href="/search/cond-mat?searchtype=author&query=Elmers%2C+H+J">H. J. Elmers</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2306.02170v1-abstract-short" style="display: inline;"> Altermagnets are an emerging third elementary class of magnets. Unlike ferromagnets, their distinct crystal symmetries inhibit magnetization while, unlike antiferromagnets, they promote strong spin polarization in the band structure. The corresponding unconventional mechanism of timereversal symmetry breaking without magnetization in the electronic spectra has been regarded as a primary signature… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.02170v1-abstract-full').style.display = 'inline'; document.getElementById('2306.02170v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.02170v1-abstract-full" style="display: none;"> Altermagnets are an emerging third elementary class of magnets. Unlike ferromagnets, their distinct crystal symmetries inhibit magnetization while, unlike antiferromagnets, they promote strong spin polarization in the band structure. The corresponding unconventional mechanism of timereversal symmetry breaking without magnetization in the electronic spectra has been regarded as a primary signature of altermagnetism, but has not been experimentally visualized to date. We directly observe strong time-reversal symmetry breaking in the band structure of altermagnetic RuO$_2$ by detecting magnetic circular dichroism in angle-resolved photoemission spectra. Our experimental results, supported by ab initio calculations, establish the microscopic electronic-structure basis for a family of novel phenomena and functionalities in fields ranging from topological matter to spintronics, that are based on the unconventional time-reversal symmetry breaking in altermagnets. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.02170v1-abstract-full').style.display = 'none'; document.getElementById('2306.02170v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.00168">arXiv:2304.00168</a> <span> [<a href="https://arxiv.org/pdf/2304.00168">pdf</a>, <a href="https://arxiv.org/format/2304.00168">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Dynamical Scaling Reveals Topological Defects and Anomalous Evolution of a Photoinduced Phase Transition </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Orenstein%2C+G">Gal Orenstein</a>, <a href="/search/cond-mat?searchtype=author&query=Duncan%2C+R+A">Ryan A. Duncan</a>, <a href="/search/cond-mat?searchtype=author&query=Munoz%2C+G+A+d+l+P">Gilberto A. de la Pena Munoz</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+Y">Yijing Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">Viktor Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L">Quynh Le Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Teitelbaum%2C+S">Samuel Teitelbaum</a>, <a href="/search/cond-mat?searchtype=author&query=Singh%2C+A+G">Anisha G. Singh</a>, <a href="/search/cond-mat?searchtype=author&query=Mankowsky%2C+R">Roman Mankowsky</a>, <a href="/search/cond-mat?searchtype=author&query=Lemke%2C+H">Henrik Lemke</a>, <a href="/search/cond-mat?searchtype=author&query=Sander%2C+M">Mathias Sander</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+Y">Yunpei Deng</a>, <a href="/search/cond-mat?searchtype=author&query=Arrell%2C+C">Christopher Arrell</a>, <a href="/search/cond-mat?searchtype=author&query=Fisher%2C+I+R">Ian R. Fisher</a>, <a href="/search/cond-mat?searchtype=author&query=Reis%2C+D+A">David A. Reis</a>, <a href="/search/cond-mat?searchtype=author&query=Trigo%2C+M">Mariano Trigo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2304.00168v2-abstract-short" style="display: inline;"> Nonequilibrium states of quantum materials can exhibit exotic properties and enable unprecedented functionality and applications. These transient states are inherently inhomogeneous, characterized by the formation of topologically protected structures, requiring nanometer spatial resolution on femtosecond timescales to resolve their evolution. Using ultrafast total x-ray scattering at a free elect… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.00168v2-abstract-full').style.display = 'inline'; document.getElementById('2304.00168v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.00168v2-abstract-full" style="display: none;"> Nonequilibrium states of quantum materials can exhibit exotic properties and enable unprecedented functionality and applications. These transient states are inherently inhomogeneous, characterized by the formation of topologically protected structures, requiring nanometer spatial resolution on femtosecond timescales to resolve their evolution. Using ultrafast total x-ray scattering at a free electron laser and a sophisticated scaling analysis, we gain unique access to the dynamics on the relevant mesoscopic lengthscales. Our results provide direct evidence that ultrafast excitation of LaTe$_3$ leads to formation of topological vortex strings of the charge density wave. These dislocations of the charge density wave exhibit anomalous, subdiffusive dynamics, slowing the equilibration process, providing rare insight into the nonequilibrium mesoscopic response in a quantum material. Our findings establish a general framework to investigate properties of topological defects, which are expected to be ubiquitous in nonequilibrium phase transitions and may arrest equilibration and enhance competing orders. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.00168v2-abstract-full').style.display = 'none'; document.getElementById('2304.00168v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.18015">arXiv:2303.18015</a> <span> [<a href="https://arxiv.org/pdf/2303.18015">pdf</a>, <a href="https://arxiv.org/format/2303.18015">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Quantum Gates with Oscillating Exchange Interaction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+D+Q+L">Daniel Q. L. Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Heinz%2C+I">Irina Heinz</a>, <a href="/search/cond-mat?searchtype=author&query=Burkard%2C+G">Guido Burkard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.18015v3-abstract-short" style="display: inline;"> Two-qubit gates between spin qubits are often performed using a rectangular or an adiabatic exchange interaction pulse resulting in a CZ gate. An oscillating exchange pulse not only performs a CZ gate, but also enables the iSWAP gate, which offers more flexibility to perform quantum algorithms. We provide a detailed description for two-qubit gates using resonant and off-resonant exchange pulses, g… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.18015v3-abstract-full').style.display = 'inline'; document.getElementById('2303.18015v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.18015v3-abstract-full" style="display: none;"> Two-qubit gates between spin qubits are often performed using a rectangular or an adiabatic exchange interaction pulse resulting in a CZ gate. An oscillating exchange pulse not only performs a CZ gate, but also enables the iSWAP gate, which offers more flexibility to perform quantum algorithms. We provide a detailed description for two-qubit gates using resonant and off-resonant exchange pulses, give conditions for performing the respective gates, and compare their performance to the state-of-the-art static counterpart. We find that for relatively low charge noise the gates still perform reliably and compare to the conventional CZ gate. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.18015v3-abstract-full').style.display = 'none'; document.getElementById('2303.18015v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.08703">arXiv:2301.08703</a> <span> [<a href="https://arxiv.org/pdf/2301.08703">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Quenched lattice fluctuations in optically driven SrTiO3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fechner%2C+M">M. Fechner</a>, <a href="/search/cond-mat?searchtype=author&query=F%C3%B6rst%2C+M">M. F枚rst</a>, <a href="/search/cond-mat?searchtype=author&query=Orenstein%2C+G">G. Orenstein</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">V. Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=Disa%2C+A+S">A. S. Disa</a>, <a href="/search/cond-mat?searchtype=author&query=Buzzi%2C+M">M. Buzzi</a>, <a href="/search/cond-mat?searchtype=author&query=von+Hoegen%2C+A">A. von Hoegen</a>, <a href="/search/cond-mat?searchtype=author&query=de+la+Pena%2C+G">G. de la Pena</a>, <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L">Q. L Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Mankowsky%2C+R">R. Mankowsky</a>, <a href="/search/cond-mat?searchtype=author&query=Sander%2C+M">M. Sander</a>, <a href="/search/cond-mat?searchtype=author&query=Lemke%2C+H">H. Lemke</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+Y">Y. Deng</a>, <a href="/search/cond-mat?searchtype=author&query=Trigo%2C+M">M. Trigo</a>, <a href="/search/cond-mat?searchtype=author&query=Cavalleri%2C+A">A. Cavalleri</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.08703v1-abstract-short" style="display: inline;"> Many functionally relevant ferroic phenomena in quantum materials can be manipulated by driving the lattice coherently with optical and terahertz pulses. New physical phenomena and non-equilibrium phases that have no equilibrium counterpart have been discovered following these protocols. The underlying structural dynamics has been mostly studied by recording the average atomic position along dynam… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.08703v1-abstract-full').style.display = 'inline'; document.getElementById('2301.08703v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.08703v1-abstract-full" style="display: none;"> Many functionally relevant ferroic phenomena in quantum materials can be manipulated by driving the lattice coherently with optical and terahertz pulses. New physical phenomena and non-equilibrium phases that have no equilibrium counterpart have been discovered following these protocols. The underlying structural dynamics has been mostly studied by recording the average atomic position along dynamical structural coordinates with elastic scattering methods. However, crystal lattice fluctuations, which are known to influence phase transitions in equilibrium, are also expected to determine these dynamics but have rarely been explored. Here, we study the driven dynamics of the quantum paraelectric SrTiO3, in which mid-infrared drives have been shown to induce a metastable ferroelectric state. Crucial in these physics is the competition between the polar instability and antiferrodistortive rotations, which in equilibrium frustrate the formation of long-range ferroelectricity. We make use of high intensity mid-infrared optical pulses to resonantly drive a Ti-O stretching mode at 17 THz, and we measure the resulting change in lattice fluctuations using time-resolved x-ray diffuse scattering at a free electron laser. After a prompt increase, we observe a long-lived quench in R-point antiferrodistortive lattice fluctuations. The enhancement and reduction in lattice fluctuations are explained theoretically by considering fourth-order nonlinear phononic interactions and third-order coupling to the driven optical phonon and to lattice strain, respectively. These observations provide a number of new and testable hypotheses for the physics of light-induced ferroelectricity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.08703v1-abstract-full').style.display = 'none'; document.getElementById('2301.08703v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.17483">arXiv:2210.17483</a> <span> [<a href="https://arxiv.org/pdf/2210.17483">pdf</a>, <a href="https://arxiv.org/format/2210.17483">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Ultrafast x-ray scattering reveals composite amplitude collective mode in the Weyl charge density wave material (TaSe$_4$)$_2$I </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L">Quynh L. Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Duncan%2C+R+A">Ryan A. Duncan</a>, <a href="/search/cond-mat?searchtype=author&query=Orenstein%2C+G">Gal Orenstein</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+Y">Yijing Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">Viktor Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=de+la+Pena%2C+G">Gilberto de la Pena</a>, <a href="/search/cond-mat?searchtype=author&query=Ornelas-Skarin%2C+C">Chance Ornelas-Skarin</a>, <a href="/search/cond-mat?searchtype=author&query=Reis%2C+D+A">David A. Reis</a>, <a href="/search/cond-mat?searchtype=author&query=Abbamonte%2C+P">Peter Abbamonte</a>, <a href="/search/cond-mat?searchtype=author&query=Bettler%2C+S">Simon Bettler</a>, <a href="/search/cond-mat?searchtype=author&query=Chollet%2C+M">Matthieu Chollet</a>, <a href="/search/cond-mat?searchtype=author&query=Hoffmann%2C+M+C">Matthias C. Hoffmann</a>, <a href="/search/cond-mat?searchtype=author&query=Hurley%2C+M">Matthew Hurley</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Soyeun Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kirchmann%2C+P+S">Patrick S. Kirchmann</a>, <a href="/search/cond-mat?searchtype=author&query=Kubota%2C+Y">Yuya Kubota</a>, <a href="/search/cond-mat?searchtype=author&query=Mahmood%2C+F">Fahad Mahmood</a>, <a href="/search/cond-mat?searchtype=author&query=Miller%2C+A">Alexander Miller</a>, <a href="/search/cond-mat?searchtype=author&query=Osaka%2C+T">Taito Osaka</a>, <a href="/search/cond-mat?searchtype=author&query=Qu%2C+K">Kejian Qu</a>, <a href="/search/cond-mat?searchtype=author&query=Sato%2C+T">Takahiro Sato</a>, <a href="/search/cond-mat?searchtype=author&query=Shoemaker%2C+D+P">Daniel P. Shoemaker</a>, <a href="/search/cond-mat?searchtype=author&query=Sirica%2C+N">Nicholas Sirica</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+S">Sanghoon Song</a>, <a href="/search/cond-mat?searchtype=author&query=Stanton%2C+J">Jade Stanton</a> , et al. (5 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.17483v2-abstract-short" style="display: inline;"> We report ultrafast x-ray scattering experiments of the quasi-1D charge density wave (CDW) material (TaSe$_4$)$_2$I following photoexcitation with femtosecond infrared laser pulses. From the time-dependent diffraction signal at the CDW sidebands we identify an amplitude mode derived primarily from the transverse acoustic component of the CDW static distortion. The dynamics of this acoustic amplitu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.17483v2-abstract-full').style.display = 'inline'; document.getElementById('2210.17483v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.17483v2-abstract-full" style="display: none;"> We report ultrafast x-ray scattering experiments of the quasi-1D charge density wave (CDW) material (TaSe$_4$)$_2$I following photoexcitation with femtosecond infrared laser pulses. From the time-dependent diffraction signal at the CDW sidebands we identify an amplitude mode derived primarily from the transverse acoustic component of the CDW static distortion. The dynamics of this acoustic amplitude mode are described well by a model of a displacive excitation, which we interpret as mediated through a coupling to the optical phonon component associated with the tetramerization of the Ta chains. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.17483v2-abstract-full').style.display = 'none'; document.getElementById('2210.17483v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.14207">arXiv:2210.14207</a> <span> [<a href="https://arxiv.org/pdf/2210.14207">pdf</a>, <a href="https://arxiv.org/format/2210.14207">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41563-023-01504-5">10.1038/s41563-023-01504-5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of the massive Lee-Fukuyama phason in a charge density wave insulator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Soyeun Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Lv%2C+Y">Yinchuan Lv</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+X">Xiao-Qi Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+C">Chengxi Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Bielinski%2C+N">Nina Bielinski</a>, <a href="/search/cond-mat?searchtype=author&query=Murzabekova%2C+A">Azel Murzabekova</a>, <a href="/search/cond-mat?searchtype=author&query=Qu%2C+K">Kejian Qu</a>, <a href="/search/cond-mat?searchtype=author&query=Duncan%2C+R+A">Ryan A. Duncan</a>, <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L+D">Quynh L. D. Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Trigo%2C+M">Mariano Trigo</a>, <a href="/search/cond-mat?searchtype=author&query=Shoemaker%2C+D+P">Daniel P. Shoemaker</a>, <a href="/search/cond-mat?searchtype=author&query=Bradlyn%2C+B">Barry Bradlyn</a>, <a href="/search/cond-mat?searchtype=author&query=Mahmood%2C+F">Fahad Mahmood</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.14207v1-abstract-short" style="display: inline;"> The lowest-lying fundamental excitation of an incommensurate charge density wave (CDW) material is widely believed to be a massless phason -- a collective modulation of the phase of the CDW order parameter. However, as first pointed out by Lee and Fukuyama, long-range Coulomb interactions should push the phason energy up to the plasma energy of the CDW condensate, resulting in a massive phason and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.14207v1-abstract-full').style.display = 'inline'; document.getElementById('2210.14207v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.14207v1-abstract-full" style="display: none;"> The lowest-lying fundamental excitation of an incommensurate charge density wave (CDW) material is widely believed to be a massless phason -- a collective modulation of the phase of the CDW order parameter. However, as first pointed out by Lee and Fukuyama, long-range Coulomb interactions should push the phason energy up to the plasma energy of the CDW condensate, resulting in a massive phason and a fully gapped spectrum. Whether such behavior occurs in a CDW system has been unresolved for more than four decades. Using time-domain THz emission spectroscopy, we investigate this issue in the material (TaSe$_4$)$_2$I, a classical example of a quasi-one-dimensional CDW insulator. Upon transient photoexcitation at low temperatures, we find the material strikingly emits coherent, narrow-band THz radiation. The frequency, polarization and temperature-dependence of the emitted radiation imply the existence of a phason that acquires mass by coupling to long-range Coulomb interaction. Our observations constitute the first direct evidence of the massive "Lee-Fukuyama" phason and highlight the potential applicability of fundamental collective modes of correlated materials as compact and robust sources of THz radiation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.14207v1-abstract-full').style.display = 'none'; document.getElementById('2210.14207v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures. SI available on request</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.11528">arXiv:2209.11528</a> <span> [<a href="https://arxiv.org/pdf/2209.11528">pdf</a>, <a href="https://arxiv.org/format/2209.11528">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1073/pnas.2400727121">10.1073/pnas.2400727121 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Orbital-selective time-domain signature of nematicity dynamics in the charge-density-wave phase of La$_{1.65}$Eu$_{0.2}$Sr$_{0.15}$CuO$_4$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Bluschke%2C+M">Martin Bluschke</a>, <a href="/search/cond-mat?searchtype=author&query=Gupta%2C+N+K">Naman K. Gupta</a>, <a href="/search/cond-mat?searchtype=author&query=Jang%2C+H">Hoyoung Jang</a>, <a href="/search/cond-mat?searchtype=author&query=Husain%2C+A+A">Ali A. Husain</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+B">Byungjune Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Na%2C+M">MengXing Na</a>, <a href="/search/cond-mat?searchtype=author&query=Remedios%2C+B+D">Brandon Dos Remedios</a>, <a href="/search/cond-mat?searchtype=author&query=Smit%2C+S">Steef Smit</a>, <a href="/search/cond-mat?searchtype=author&query=Moen%2C+P">Peter Moen</a>, <a href="/search/cond-mat?searchtype=author&query=Park%2C+S">Sang-Youn Park</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+M">Minseok Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Jang%2C+D">Dogeun Jang</a>, <a href="/search/cond-mat?searchtype=author&query=Choi%2C+H">Hyeongi Choi</a>, <a href="/search/cond-mat?searchtype=author&query=Sutarto%2C+R">Ronny Sutarto</a>, <a href="/search/cond-mat?searchtype=author&query=Reid%2C+A+H">Alexander H. Reid</a>, <a href="/search/cond-mat?searchtype=author&query=Dakovski%2C+G+L">Georgi L. Dakovski</a>, <a href="/search/cond-mat?searchtype=author&query=Coslovich%2C+G">Giacomo Coslovich</a>, <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L">Quynh L. Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Burdet%2C+N+G">Nicolas G. Burdet</a>, <a href="/search/cond-mat?searchtype=author&query=Lin%2C+M">Ming-Fu Lin</a>, <a href="/search/cond-mat?searchtype=author&query=Revcolevschi%2C+A">Alexandre Revcolevschi</a>, <a href="/search/cond-mat?searchtype=author&query=Park%2C+J">Jae-Hoon Park</a>, <a href="/search/cond-mat?searchtype=author&query=Geck%2C+J">Jochen Geck</a>, <a href="/search/cond-mat?searchtype=author&query=Turner%2C+J+J">Joshua J. Turner</a>, <a href="/search/cond-mat?searchtype=author&query=Damascelli%2C+A">Andrea Damascelli</a> , et al. (1 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.11528v3-abstract-short" style="display: inline;"> Understanding the interplay between charge, nematic, and structural ordering tendencies in cuprate superconductors is critical to unraveling their complex phase diagram. Using pump-probe time-resolved resonant x-ray scattering on the (0 0 1) Bragg peak at the Cu $L_3$ and O $K$ resonances, we investigate non-equilibrium dynamics of $Q_a = Q_b = 0$ nematic order and its association with both charge… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.11528v3-abstract-full').style.display = 'inline'; document.getElementById('2209.11528v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.11528v3-abstract-full" style="display: none;"> Understanding the interplay between charge, nematic, and structural ordering tendencies in cuprate superconductors is critical to unraveling their complex phase diagram. Using pump-probe time-resolved resonant x-ray scattering on the (0 0 1) Bragg peak at the Cu $L_3$ and O $K$ resonances, we investigate non-equilibrium dynamics of $Q_a = Q_b = 0$ nematic order and its association with both charge density wave (CDW) order and lattice dynamics in La$_{1.65}$Eu$_{0.2}$Sr$_{0.15}$CuO$_4$. The orbital selectivity of the resonant x-ray scattering cross-section allows nematicity dynamics associated with the planar O 2$p$ and Cu 3$d$ states to be distinguished from the response of anisotropic lattice distortions. A direct time-domain comparison of CDW translational-symmetry breaking and nematic rotational-symmetry breaking reveals that these broken symmetries remain closely linked in the photoexcited state, consistent with the stability of CDW topological defects in the investigated pump fluence regime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.11528v3-abstract-full').style.display = 'none'; document.getElementById('2209.11528v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.14704">arXiv:2110.14704</a> <span> [<a href="https://arxiv.org/pdf/2110.14704">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic and Molecular Clusters">physics.atm-clus</span> </div> </div> <p class="title is-5 mathjax"> Direct observation of enhanced electron-phonon coupling in copper nanoparticles in the warm-dense matter regime </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L+D">Quynh L. D. Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Simoni%2C+J">Jacopo Simoni</a>, <a href="/search/cond-mat?searchtype=author&query=Dorney%2C+K+M">Kevin M. Dorney</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+X">Xun Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Ellis%2C+J+L">Jennifer L. Ellis</a>, <a href="/search/cond-mat?searchtype=author&query=Brooks%2C+N+J">Nathan J. Brooks</a>, <a href="/search/cond-mat?searchtype=author&query=Hickstein%2C+D+D">Daniel D. Hickstein</a>, <a href="/search/cond-mat?searchtype=author&query=Grennell%2C+A+G">Amanda G. Grennell</a>, <a href="/search/cond-mat?searchtype=author&query=Yazdi%2C+S">Sadegh Yazdi</a>, <a href="/search/cond-mat?searchtype=author&query=Campbell%2C+E+E+B">Eleanor E. B. Campbell</a>, <a href="/search/cond-mat?searchtype=author&query=Tan%2C+L+Z">Liang Z. Tan</a>, <a href="/search/cond-mat?searchtype=author&query=Prendergast%2C+D">David Prendergast</a>, <a href="/search/cond-mat?searchtype=author&query=Daligault%2C+J">Jerome Daligault</a>, <a href="/search/cond-mat?searchtype=author&query=Kapteyn%2C+H+C">Henry C. Kapteyn</a>, <a href="/search/cond-mat?searchtype=author&query=Murnane%2C+M+M">Margaret M. Murnane</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2110.14704v4-abstract-short" style="display: inline;"> Warm-dense matter (WDM) is a highly-excited state that lies at the confluence of solids, plasmas, and liquids and that cannot be described by equilibrium theories. The transient nature of this state when created in a laboratory, as well as the difficulties in probing the strongly-coupled interactions between the electrons and the ions, make it challenging to develop a complete understanding of mat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.14704v4-abstract-full').style.display = 'inline'; document.getElementById('2110.14704v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.14704v4-abstract-full" style="display: none;"> Warm-dense matter (WDM) is a highly-excited state that lies at the confluence of solids, plasmas, and liquids and that cannot be described by equilibrium theories. The transient nature of this state when created in a laboratory, as well as the difficulties in probing the strongly-coupled interactions between the electrons and the ions, make it challenging to develop a complete understanding of matter in this regime. In this work, by exciting isolated ~8 nm nanoparticles with a femtosecond laser below the ablation threshold, we create uniformly-excited WDM. We then use photoelectron spectroscopy to track the instantaneous electron temperature and directly extract the strongest electron-ion coupling observed experimentally to date. By directly comparing with state-of-the-art theories, we confirm that the superheated nanoparticles lie at the boundary between hot solids and plasmas, with associated strong electron-ion coupling. This is evidenced both by the fast energy loss of electrons to ions, as well as a strong modulation of the electron temperature by acoustic oscillations in the nanoparticle. This work demonstrates a new route for experimental exploration and theoretical validation of the exotic properties of WDM. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.14704v4-abstract-full').style.display = 'none'; document.getElementById('2110.14704v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 4 figures</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a 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